package com.kexio.enterprise.observability;

import com.kexio.enterprise.observability.health.HealthService;
import com.kexio.enterprise.observability.health.checker.HealthChecker;
import com.kexio.enterprise.observability.health.domain.HealthInfo;
import com.kexio.enterprise.observability.health.enums.HealthStatus;
import com.kexio.enterprise.observability.health.listener.HealthStatusListener;
import com.kexio.enterprise.observability.health.result.HealthCheckResult;
import com.kexio.enterprise.observability.logging.LogService;
import com.kexio.enterprise.observability.logging.aspect.LogAspect;
import com.kexio.enterprise.observability.logging.aspect.PerformanceAspect;
import com.kexio.enterprise.observability.logging.impl.DefaultLogService;
import com.kexio.enterprise.observability.metrics.BusinessMetrics;
import com.kexio.enterprise.observability.metrics.MetricsService;
import com.kexio.enterprise.observability.metrics.domain.ApplicationMetrics;
import com.kexio.enterprise.observability.metrics.domain.SystemMetrics;
import com.kexio.enterprise.observability.metrics.enums.ExportFormat;
import com.kexio.enterprise.observability.metrics.statistics.DistributionStatistics;
import com.kexio.enterprise.observability.metrics.statistics.TimerStatistics;
import com.kexio.enterprise.observability.metrics.timer.TimerSample;
import com.kexio.enterprise.observability.tracing.TracingService;
import com.kexio.enterprise.observability.tracing.context.TraceContext;
import com.kexio.enterprise.observability.tracing.domain.SpanLog;
import com.kexio.enterprise.observability.tracing.domain.TraceInfo;
import com.kexio.enterprise.observability.tracing.enums.SpanStatus;
import com.kexio.enterprise.observability.tracing.query.TracingQueryCriteria;
import com.kexio.enterprise.observability.tracing.statistics.TracingStatistics;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.EnableAspectJAutoProxy;

import jakarta.annotation.PostConstruct;

/**
 * 可观测性模块自动配置
 * 
 * 功能说明：
 * - 日志组件：操作日志、性能监控
 * - 指标组件：业务指标收集
 * - 追踪组件：分布式链路追踪
 * - 健康检查：应用健康监控
 * 
 * @author Kexio
 * @since 1.0.0
 */
@Configuration
@EnableAspectJAutoProxy
@ConditionalOnProperty(name = "kexio.enterprise.observability.enabled", havingValue = "true", matchIfMissing = true)
public class ObservabilityAutoConfiguration {

    private static final Logger log = LoggerFactory.getLogger(ObservabilityAutoConfiguration.class);

    @PostConstruct
    public void init() {
        log.info("==> Kexio可观测性模块已启用");
        log.debug("可观测性模块包含: 操作日志、性能监控、指标收集、链路追踪、健康检查");
    }

    /**
     * 日志服务
     */
    @Bean
    @ConditionalOnMissingBean
    @ConditionalOnProperty(name = "kexio.enterprise.observability.logging.enabled", havingValue = "true", matchIfMissing = true)
    public LogService logService() {
        log.debug("==> 创建LogService实例");
        return new DefaultLogService();
    }

    /**
     * 操作日志AOP切面
     */
    @Bean
    @ConditionalOnMissingBean
    @ConditionalOnProperty(name = "kexio.enterprise.observability.logging.enabled", havingValue = "true", matchIfMissing = true)
    public LogAspect logAspect(LogService logService, ObjectMapper objectMapper) {
        log.debug("==> 创建LogAspect实例");
        return new LogAspect(logService, objectMapper);
    }

    /**
     * 性能监控AOP切面
     */
    @Bean
    @ConditionalOnMissingBean
    @ConditionalOnProperty(name = "kexio.enterprise.observability.performance.enabled", havingValue = "true", matchIfMissing = true)
    public PerformanceAspect performanceAspect() {
        log.debug("==> 创建PerformanceAspect实例");
        return new PerformanceAspect();
    }

    /**
     * 指标服务（条件性创建）
     */
    @Bean
    @ConditionalOnMissingBean
    @ConditionalOnProperty(name = "kexio.enterprise.observability.metrics.enabled", havingValue = "true", matchIfMissing = true)
    public MetricsService metricsService() {
        log.debug("==> 创建MetricsService实例");
        // TODO: 创建默认的MetricsService实现
        return new DefaultMetricsService();
    }

    /**
     * 业务指标组件
     */
    @Bean
    @ConditionalOnMissingBean
    @ConditionalOnProperty(name = "kexio.enterprise.observability.metrics.enabled", havingValue = "true", matchIfMissing = true)
    public BusinessMetrics businessMetrics(MetricsService metricsService) {
        log.debug("==> 创建BusinessMetrics实例");
        return new BusinessMetrics(metricsService);
    }

    /**
     * 链路追踪服务（条件性创建）
     */
    @Bean
    @ConditionalOnMissingBean
    @ConditionalOnProperty(name = "kexio.enterprise.observability.tracing.enabled", havingValue = "true", matchIfMissing = true)
    public TracingService tracingService() {
        log.debug("==> 创建TracingService实例");
        // TODO: 创建默认的TracingService实现
        return new DefaultTracingService();
    }

    /**
     * 健康检查服务（条件性创建）
     */
    @Bean
    @ConditionalOnMissingBean
    @ConditionalOnProperty(name = "kexio.enterprise.observability.health.enabled", havingValue = "true", matchIfMissing = true)
    public HealthService healthService() {
        log.debug("==> 创建HealthService实例");
        // TODO: 创建默认的HealthService实现
        return new DefaultHealthService();
    }

    /**
     * 默认指标服务实现（简化版）
     */
    private static class DefaultMetricsService implements MetricsService {
        private static final Logger log = LoggerFactory.getLogger(DefaultMetricsService.class);

        @Override
        public void incrementCounter(String name, java.util.Map<String, String> tags) {
            log.debug("Counter incremented: {} with tags: {}", name, tags);
        }

        @Override
        public void incrementCounter(String name, double amount, java.util.Map<String, String> tags) {
            log.debug("Counter incremented: {} by {} with tags: {}", name, amount, tags);
        }

        @Override
        public void recordGauge(String name, double value, java.util.Map<String, String> tags) {
            log.debug("Gauge recorded: {} = {} with tags: {}", name, value, tags);
        }

        @Override
        public void recordTimer(String name, long duration, java.util.Map<String, String> tags) {
            log.debug("Timer recorded: {} = {}ms with tags: {}", name, duration, tags);
        }

        @Override
        public void recordDistribution(String name, double value, java.util.Map<String, String> tags) {
            log.debug("Distribution recorded: {} = {} with tags: {}", name, value, tags);
        }

        @Override
        public void recordHistogram(String name, double value, java.util.Map<String, String> tags) {
            log.debug("Histogram recorded: {} = {} with tags: {}", name, value, tags);
        }

        @Override
        public double getCounterValue(String name, java.util.Map<String, String> tags) {
            return 0.0;
        }

        @Override
        public double getGaugeValue(String name, java.util.Map<String, String> tags) {
            return 0.0;
        }

        @Override
        public TimerStatistics getTimerStatistics(String name, java.util.Map<String, String> tags) {
            return new TimerStatistics();
        }

        @Override
        public DistributionStatistics getDistributionStatistics(String name, java.util.Map<String, String> tags) {
            return new DistributionStatistics();
        }

        @Override
        public java.util.Set<String> getMetricNames() {
            return java.util.Collections.emptySet();
        }

        @Override
        public java.util.Set<java.util.Map<String, String>> getMetricTags(String name) {
            return java.util.Collections.emptySet();
        }

        @Override
        public void clearMetrics() {
            log.info("Metrics cleared");
        }

        @Override
        public String exportMetrics(ExportFormat format) {
            return "# Metrics export not implemented";
        }

        @Override
        public SystemMetrics getSystemMetrics() {
            return new SystemMetrics();
        }

        @Override
        public ApplicationMetrics getApplicationMetrics() {
            return new ApplicationMetrics();
        }

        @Override
        public void recordEvent(String eventName, java.util.Map<String, Object> properties) {
            log.debug("Event recorded: {} with properties: {}", eventName, properties);
        }

        @Override
        public TimerSample startTimer(String name, java.util.Map<String, String> tags) {
            long startTime = System.currentTimeMillis();
            return new TimerSample() {
                @Override
                public void stop() {
                    long duration = System.currentTimeMillis() - startTime;
                    recordTimer(name, duration, tags);
                }

                @Override
                public long elapsed() {
                    return System.currentTimeMillis() - startTime;
                }
            };
        }
    }

    /**
     * 默认链路追踪服务实现（简化版）
     */
    private static class DefaultTracingService implements TracingService {
        private static final Logger log = LoggerFactory.getLogger(DefaultTracingService.class);

        @Override
        public TraceContext startTrace(String operationName) {
            log.debug("Trace started: {}", operationName);
            return new SimpleTraceContext(java.util.UUID.randomUUID().toString(), operationName);
        }

        @Override
        public TraceContext startSpan(TraceContext parentContext, String operationName) {
            log.debug("Span started: {} under {}", operationName, parentContext.getTraceId());
            return new SimpleTraceContext(parentContext.getTraceId(), operationName);
        }

        @Override
        public void finishSpan(TraceContext context) {
            log.debug("Span finished: {}", context.getOperationName());
        }

        @Override
        public void addTag(TraceContext context, String key, String value) {
            log.debug("Tag added to {}: {}={}", context.getOperationName(), key, value);
        }

        @Override
        public void addTags(TraceContext context, java.util.Map<String, String> tags) {
            log.debug("Tags added to {}: {}", context.getOperationName(), tags);
        }

        @Override
        public void addLog(TraceContext context, String message) {
            log.debug("Log added to {}: {}", context.getOperationName(), message);
        }

        @Override
        public void addLog(TraceContext context, java.util.Map<String, Object> fields) {
            log.debug("Log added to {}: {}", context.getOperationName(), fields);
        }

        @Override
        public void recordException(TraceContext context, Throwable exception) {
            log.debug("Exception recorded in {}: {}", context.getOperationName(), exception.getMessage());
        }

        @Override
        public void setSpanStatus(TraceContext context, SpanStatus status) {
            log.debug("Status set for {}: {}", context.getOperationName(), status);
        }

        @Override
        public TraceContext getCurrentContext() {
            return null;
        }

        @Override
        public void setCurrentContext(TraceContext context) {
            log.debug("Current context set: {}", context.getOperationName());
        }

        @Override
        public TraceContext extractContext(java.util.Map<String, String> headers) {
            return null;
        }

        @Override
        public void injectContext(TraceContext context, java.util.Map<String, String> headers) {
            headers.put("X-Trace-Id", context.getTraceId());
        }

        @Override
        public TraceInfo getTraceInfo(String traceId) {
            return null;
        }

        @Override
        public java.util.List<TraceInfo> queryTraces(TracingQueryCriteria criteria) {
            return java.util.Collections.emptyList();
        }

        @Override
        public TracingStatistics getTracingStatistics(java.time.LocalDateTime startTime, java.time.LocalDateTime endTime) {
            return new TracingStatistics();
        }

        @Override
        public void clearTraces() {
            log.info("Traces cleared");
        }

        @Override
        public void setTracingEnabled(boolean enabled) {
            log.info("Tracing enabled: {}", enabled);
        }

        private static class SimpleTraceContext implements TraceContext {
            private final String traceId;
            private final String spanId;
            private final String operationName;
            private final java.time.LocalDateTime startTime;

            public SimpleTraceContext(String traceId, String operationName) {
                this.traceId = traceId;
                this.spanId = java.util.UUID.randomUUID().toString();
                this.operationName = operationName;
                this.startTime = java.time.LocalDateTime.now();
            }

            @Override
            public String getTraceId() { return traceId; }

            @Override
            public String getSpanId() { return spanId; }

            @Override
            public String getParentSpanId() { return null; }

            @Override
            public String getOperationName() { return operationName; }

            @Override
            public boolean isSampled() { return true; }

            @Override
            public java.time.LocalDateTime getStartTime() { return startTime; }

            @Override
            public java.util.Map<String, String> getTags() { return java.util.Collections.emptyMap(); }

            @Override
            public java.util.List<SpanLog> getLogs() { return java.util.Collections.emptyList(); }

            @Override
            public SpanStatus getStatus() { return SpanStatus.OK; }

            @Override
            public boolean isFinished() { return false; }
        }
    }

    /**
     * 默认健康检查服务实现（简化版）
     */
    private static class DefaultHealthService implements HealthService {
        private static final Logger log = LoggerFactory.getLogger(DefaultHealthService.class);

        @Override
        public HealthStatus getOverallHealth() {
            return HealthStatus.UP;
        }

        @Override
        public HealthInfo getDetailedHealth() {
            HealthInfo info = new HealthInfo();
            info.setOverallStatus(HealthStatus.UP);
            info.setCheckTime(java.time.LocalDateTime.now());
            info.setComponents(java.util.Collections.emptyMap());
            return info;
        }

        @Override
        public HealthStatus checkComponentHealth(String componentName) {
            log.debug("Health check for component: {}", componentName);
            return HealthStatus.UP;
        }

        @Override
        public void registerHealthChecker(String name, HealthChecker checker) {
            log.debug("Health checker registered: {}", name);
        }

        @Override
        public void unregisterHealthChecker(String name) {
            log.debug("Health checker unregistered: {}", name);
        }

        @Override
        public java.util.Map<String, HealthChecker> getAllHealthCheckers() {
            return java.util.Collections.emptyMap();
        }

        @Override
        public java.util.Map<String, HealthCheckResult> performAllHealthChecks() {
            return java.util.Collections.emptyMap();
        }

        @Override
        public java.util.List<HealthCheckResult> getHealthHistory(String componentName, int hours) {
            return java.util.Collections.emptyList();
        }

        @Override
        public void setHealthCheckInterval(String componentName, long intervalMs) {
            log.debug("Health check interval set for {}: {}ms", componentName, intervalMs);
        }

        @Override
        public void setHealthCheckEnabled(String componentName, boolean enabled) {
            log.debug("Health check enabled for {}: {}", componentName, enabled);
        }

        @Override
        public void addHealthStatusListener(HealthStatusListener listener) {
            log.debug("Health status listener added");
        }

        @Override
        public void removeHealthStatusListener(HealthStatusListener listener) {
            log.debug("Health status listener removed");
        }
    }
}
